We put ours in large thick plastic bags, they were 25-50 litre bags. The bags were empty sand (25 litre) or poultry
feed bags (50 litre ones- I couldn't quite lift these when full).
It was incredibly messy, and we did it at about this time of year- so the compost was all really wet (and extra heavy!). We moved about 2 cubic meters of compost, it took 2 van-loads to get it to the new house!
Made loads of really good raised beds in the new place though. Worth it!